Do your eyes work? You may think they do, but the ultimate vision test isn't the one at the optometrist's office*. It's these five BuzzFeed quizzes. Take them to see if you have perfect vision or ...

Our ability to see with color vision depends on the presence and function of light-sensing pigments in the cones of our eyes. Color blindness, or color vision deficiency, happens when one or more of ...

There are three main types of color vision deficiency: red-green, blue-yellow, and complete. Color blindness, or color vision deficiency, affects the way you perceive color and can make it hard to ...